package com.cris.FIlter;


import com.alibaba.fastjson.JSON;
import com.cris.Common.BaseContext;
import com.cris.Controller.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {
    public static  final AntPathMatcher pathMatcher = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {

        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        String requestURI = request.getRequestURI();
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/Common/**",
                "/user/sendMsg",
                "/user/login"

        };

        //判断本次请求是否需要处理
        boolean check = check(urls,requestURI);
        if(check){
            log.info("本次请求{}不需要处理",requestURI);
            filterChain.doFilter(request,response);
            return;
        }

        //1判断登录状态，如果已登录则直接放行
        if(request.getSession().getAttribute("employee") != null){
            log.info("用户已登录，用户id为{}",request.getSession().getAttribute("employee"));
            Long id  = (Long) request.getSession().getAttribute("employee");

            BaseContext.setCurrentId(id);

            filterChain.doFilter(request,response);
            return;
        }

        //2判断登录状态，如果已登录则直接放行
        if(request.getSession().getAttribute("user") != null){
            log.info("用户已登录，用户id为{}",request.getSession().getAttribute("user"));
            Long userid  = (Long) request.getSession().getAttribute("user");

            BaseContext.setCurrentId(userid);

            filterChain.doFilter(request,response);
            return;
        }

        log.info("用户未登录");
        //如果未登录则返回未登录结果,通过输出流向客户端响应数据
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;
    }
    //检测本次请求是否需要放行
    public boolean check(String[] urls, String URI){
        for (String url : urls) {
            boolean match = pathMatcher.match(url, URI);
            if(match){
                return true;
            }
        }
        return false;
    }
}
